Pressure controlled trimerization for switching of anomalous Hall effect in triangular antiferromagnet Mn$_3$Sn

摘要: Here, we present a detailed theoretical and experimental study on the pressure induced switching of anomalous Hall effect (AHE) in triangular antiferromagnetic (AFM) compound Mn$_3$Sn. Our model suggests driven significant splitting in-plane Mn bond lengths $i.e.$ an effective trimerization, which turn stabilizes helical AFM ground state by modifying inter-plane exchange parameters system. We experimentally demonstrate that AHE Mn$_3$Sn reduces from 5$\mu\Omega$ cm at ambient to zero applied about 1.5 GPa. Furthermore, our dependent magnetization reveals conventional systematically transforms into phase where symmetry does not support non-vanishing Berry curvature required for realization finite AHE. The x-ray diffraction (XRD) rules out any role structural transition observed phenomenon. In addition, temperature lattice parameter is found deviate monotonic behavior when system enters phase, thereby, supporting proposed impact trimerization controlling believe makes important contribution towards understanding stabilization mechanism different magnetic states related materials their potential applications pertaining switching.